Answer to the Universe Model, The Universe Model holds that the universe originated from

To sum up, there are two main schools: one is called the steady-state universe model, which believes that the distribution of matter and physical properties of the universe on a large scale do not change with time and are stable and unchanging. Not only is it spatially homogeneous, isotropic, but also stable in time.

The other type is called evolutionary state models. It believes that the distribution and physical properties of matter in the universe on a large scale change over time.

1. The theory of expansion.

2. The theory of time, space, and parallelism (scientists believe that the universe is pluralistic, and according to Einstein's theory of relativity, any matter that has its positive matter must have its antimatter, and the two are in a balanced relative relationship, so there is another universe that we don't know about the universe we are in now.) If a person can go back in time to save a person who should have died, then for the person of the present, this person is still dead, and the past he has changed will separate from another universe, and that person is alive).

Cosmological model scientists have different views.

1. The theory of expansion.

2. The theory of time, space, and parallelism (scientists believe that the universe is pluralistic, and according to Einstein's theory of relativity, any matter that has its positive matter must have its antimatter, and the two are in a balanced relative relationship, so there is another universe that we don't know about the universe we are in now.) If a person can go back in time to save a person who should have died, then for the person of the present, this person is still dead, and the past he has changed will separate from another universe, and that person is alive).

Expands forever until everything is torn into energy

It is believed that the universe originated from the big **, but this is only conjecture. Human beings cannot understand the universe.

The universe is not spatially infinite and has no boundaries. The gravitational pull is so strong that space is bent and looped back to itself, making it quite like the surface of the Earth. If a person travels non-stop in a certain direction on the surface of the earth, he will never encounter an insurmountable obstacle or fall off the edge, but will eventually come to the point where he set out.

The space in the first type of Friedman's model is very similar to this, except that the surface of the earth is two-dimensional, while it is three-dimensional. The fourth dimension of time is also finite in scope, yet it is like a line with two endpoints or boundaries, i.e., beginnings and ends.

"Limited and unbounded" are two concepts, or is it a mistake by the landlord?

I think the universe is finite and unbounded. If divided according to whether it is finite or not, there are four modes of the universe. It can be excluded by the method of exclusion.

Infinitely bounded: logically unworkable.

Infinite and unbounded: logically feasible, but already denied by phenomena. (Based on the inference that the infinite universe should be fully illuminated).

Finite and bounded: logically feasible? I suspect that there are any boundaries that can withstand the gravitational pull of a black hole.

Finite Unbounded: Logically feasible.

As for the advantages and disadvantages, I can only say the advantages and disadvantages of the big ** universe model, there are too many universe models that have the result of the finite and unbounded universe, and I really can't do anything about it in such a short space

One day I was thinking about the metaphysical theory, and I fainted.

Or the bubble universe is easy to understand.

"After that, the reasoning will continue to go to the virtual next universe, and then repeat the infinite loop and nest it. "--- Red Rhapsody, even if human beings are virtualized layer by layer, how did the universe of advanced beings at the top evolve? How the universe evolves is a question that must be faced, and it cannot be avoided by simply pushing it onto the heads of advanced beings.

Can you get close to the edge of Earth's Eggplant?

You keep going in one direction, can you get out of the earth?

You walk, you find that no matter how you go, you just can't go out of the earth, and you can't find the edge of the earth.

Eventually, you find that you're back to square one.

When you are out of the earth: for example, you are in a spaceship outside the earth, at this time you can see the face of the ball clearly, you can also see that the earth is a ball, and the edge is around, but if you are walking on the earth, you will not be able to find the edge no matter what.

The universe is similar to this, we are in the universe, no matter how you go, you just can't get out, if we can find a way to get out of the universe, we can see the universe clearly.

Personal opinion.

There are three models of the universe, one is saddle-shaped, one is spherical, and the other is open-shaped, which depends on the expansion rate of the universe, but at present, the universe is resisting the collapse caused by the gravitational pull of ordinary matter under the action of dark matter, and there is the possibility of infinite expansion, which belongs to the third model, but in this case, the situation of space-time on the macroscopic level is estimated by Chang Tangerine, and you can search for related content on other web pages.

As Hawking said.

We think about it like a person in two-dimensional space thinks about three-dimensional space.

Finite and boundless, cosmic like fractal geometry.

Human beings have undergone many changes in the depiction of the model of the universe, from the classical mechanics of Newton's era, to Einstein's relative space-time (convex curvature), to the era of quantum mechanics, the proposal of the big ** theory, and then to the continuous recognition of the negative space-time theory. Only the combination of all national maps can depict the world map concretely, so there is no specific set of models in the theoretical field, but people pin their hopes on a unified system that is emerging nowadays, M theory, but M theory is just a unified system, not a specific model. If we are discarding some practical theories to build a crude model of the universe, then our universe starts with a singularity, expanding, and exploding. Space-time is closed as a whole, and we live on a multi-dimensional membrane, and the membrane surface is not so flat, and there is a quantum scale loss of the membrane surface on the quantum scale, and this loss is also caused by them in the multi-dimensional.

The expansion of our universe will not stop or contract one day, because our universe is open in another model (which has been confirmed by research). So our universe can roughly think of that.

The universe in which humans on Earth live is not unique, but is made up of two vast twin universes. The difference between the two universes lies in the difference in their respective atomic loads, which in layman's terms are the so-called world of matter and antimatter.

1. In the positive universe, the outer shell of an atom is composed of positrons, and these positrons are fixed in the orbit of the nucleus by antiprotons. anti-cosmic and just the opposite;

2. The two twin universes can never be touched. The claim that they can be contacted is meaningless, because there is no connection between the two (e.g., it cannot be said how many light years they are from each other, nor can it be said that they have the same concept of time, in short, there is no possibility of comparison between space and time);

3. The two universes have the same weight and the same radius;

4. The two twin universes have their own characteristics [there are not so many galaxies in the anti-universe, and the structure of each galaxy is also different], therefore, there are no alien twin stars, and there are no twin planets of the earth;

5. Two twin universes were born at the same time, but their respective concepts and scales of time are different, and the direction of time extension is not parallel. Therefore, it cannot be said that your universe exists in the same time and space as our universe, and that there is no distinction between you and me or me before you in terms of time. We can go forward in time or backward in time, and your time here is one-way, only forward.

6. In our universe, galaxies move like floating islands in the vast ocean of the universe. However, this sea is multidimensional, galaxies are full of gas, and the relationship between the universe is very different from that of the universe, because they exist in nothingness, so it is impossible to imagine the distance between them;

7. Although the two universes are not connected in time and space, the anti-universe still affects our universe. It is by analyzing this influence that we can deduce the existence of an anti-universe.

8. At the same time, our cosmology is also developing, there are many pairs of twin universes, countless pairs of twin universes are subject to their own unique speed of light, and the specific speed of light of each pair of twin universes is itself variable and controllable, that is, by virtue of this variable and controllable characteristics and corresponding technologies, we can freely travel between our own pair of twin universes in the future, and can freely travel to other twin universes. Civilizations with different levels of development exist in different universes, and human beings on earth are not loners in the universe, nor are they the end of life forms.

In the same way, it may be that our technology is not yet at the point where we can observe the edge of the universe. Hehe... According to the standard model of the universe, the universe is finite and unbounded, finite because there is an upper limit to the time and speed of expansion

You can say that again!!! A heavy blow to those who write popular science!!

When ants see the world, they think that the universe is so big, and the space that humans can imagine is still limited, unless it exceeds human imagination. Space is hierarchical, and creatures at different levels have different understandings.

The universe is invisible, and now I haven't even explored extragalactic galaxies (in short, galaxies outside the Milky Way), let alone the universe.

Inverted triangle. Your teacher said the wrong thing. Tell her to read a book. Rebuild and go.

Elementary school students have to model ...... universeMaybe it's a bit bigger.

Can you make a model of the solar system instead?

Is it OK to have a flat graphic?

You draw a map of the universe.

What solar system, what the Milky Way, what extragalactic galaxies.

Draw them all.

Of course, your formula doesn't work on the ground, the left mg is the gravitational force, and the right side is the centripetal force of circular motion with r as the radius and angular velocity as the omega. If the equation holds, then it means that all gravity is used to provide centripetal force, that is, it is in weightlessness, which obviously requires the linear velocity of the Earth's surface rotation to reach the first cosmic velocity, is it possible?

This formula is only applicable to satellites, and generally does not use the form g, because g generally refers specifically to the acceleration of gravity on the earth's surface, in the form of mg r 2.

You'd better ask an expert about this kind of question, because we don't know much about these majors.

I think this is the problem of g, because the different parameters of each celestial body (such as mass, volume, etc.) are not exactly the same, so mg can only be used within the scope of the earth, and does not mean that it can be used in other celestial bodies.

Oh my God, who's upstairs.

mmg/r^2=mg...1

mg=mw^2r ..2

The condition for the establishment of formula 1 is that it is close to the ground (that is, it can be introduced), and formula 2 is not necessarily true, and it should be mw 2r=ma

i.e. a is not necessarily g

That's it, I don't know, I'm asking.

The intrinsic connection between these two formulas is gm=gr 2.

In the second formula, if r changes, g will also change

So your judgment on the trend of the first formula is correct, i.e., the larger the radius of a planet with the same mass as the Earth, the smaller the first cosmic velocity.

The model of the universe is not the three-dimensional space that we understand in our lives, that is, the length, width and height, and the complex universe is not just a three-dimensional space, because it does not explain the size of the universe, Einstein's view of the universe, he thought that the universe is a sphere, but it was overturned, and he himself admitted that his model was problematic, and the spatial model of the universe was limited by the density of the universe, and if the density was too large, the universe would be a compressed and sealed sphere, and if the density was too small, the universe would expand endlessly, and such a model was full of holes But let me add that there are a lot of black holes in the universe, and the forces between black holes and black holes limit the expansion and contraction of the universe. And I'm saying that very clearly, do you understand? Light only deflects because light passes over a mass object, and a massive object distorts space, so light is deflected in the distorted space.

Hehe, I'm so tired, can you give it to me, thank you.

Maybe it's like a free man in a volleyball game, and it's not bound by.

A black hole can distort space-time, and if light enters the range of a black hole, it should also be distorted, but it is unknown whether it will be bound or not. The four-dimensional space of the three-dimensional space-time plus the timeline of human life is not possible anyway.

If you really want to ask what can bind light, then it may only be a five-dimensional space.

If you correct the first floor, light will only be deflected and not slowed down by any object, and the speed of light is constant anywhere in the universe, for which reason is Einstein's theory of relativity.

The speed of the universe is determined by the mass of the planet, which we call the first.

One, two, and three cosmic velocities are determined by the mass of our Earth's sun, respectively.